"Be extremely wary of predictions, especially predictions about the future."
-- Mark Twain

"Never make predictions -- especially about the future."
-- Will Rogers

"Never make predictions, particularly about the future."
-- George Bernard Shaw

"It's tough to make predictions, especially about the future."
-- Yogi Berra

"Prediction is very difficult, especially about the future."
-- Niels Bohr

"No one can predict the future. As I've grown older I've learned not to make predictions, particularly about the future."
-- Casey Stengel

"It's very hard to predict, especially about the future."
-- Dan Quayle